DTrace support was proposed and implemented by yugui (Yuki Sonoda), and further developed by tenderlove. [#2565]

Improved debugger support from TracePoint was originally proposed by Thomas Sawyer and arranged by ko1. [#6895]

NativeClient support was proposed and implemented by yugui.

Bitmap Marking GC was proposed and implemented by authornari (Narihiro Nakamura) and matz.

Various approaches on Kernel#require optimization were proposed and prototyped by many people, and coordinated by tarui and shirosaki (Hiroshi Shirosaki).

VM speedup and Float optimizations were proposed and developed by ko1.

Refinements were developed by shugo (Shugo Maeda) and matz after discussions with many people.

There are many other wonderful features and improvements, but we cannot list all of them.All the proposers and implementers deserve to be praised.Also, we thank all committers who supported all the above development and improved the integrity.

It is also worth mentioning that the OpenSSL binding was greatly improved by emboss (Martin Bosslet).

We also appreciate all people who tried preview and rc releases and reported any bugs.Without them, we couldn't have the stability of 2.0.0.Especially, hsbt (Hiroshi Shibata) for contributing a lot by checking many popular Ruby applications on 2.0.0.